fix: use target path for unshare-from-self events

[icewind1991]

Need to use the target path there.

Introduced with #2098 🙈

[cypress]

Activity    Run #2774

Run Properties:   Passed #2774  •  3fdd17dad5: fix: use target path for unshare-from-self events

Project	Activity
Branch Review	unshare-self-fixes
Run status	Passed #2774
Run duration	03m 28s
Commit	3fdd17dad5: fix: use target path for unshare-from-self events
Committer	Robin Appelman
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Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	10
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[icewind1991]

added to #2101 for the stable31 backport

[miaulalala]

/backport to stable31

[backportbot]

The backport to stable31 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable31
git pull origin stable31

# Create the new backport branch
git checkout -b backport/2103/stable31

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 030d1f2a cccf42bf

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/2103/stable31

Error: Failed to check for changes with origin/stable31: No changes found in backport branch

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Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.